Secret Knock Detecting Door Lock | Arduino Project
Unlock the door with a secret knock. In this project, I used an Arduino Uno, a piezo speaker, and a servo motor.
If a piezo speaker hears the right number of knocks in the right cadence it triggers the servo motor to turn lock/unlock the door.
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Original Project : • Secret Knock Detecting Lock
Tutorial from Grathio : https://www.instructables.com/id/Secr...
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